"United States General Index to Pension Files, 1861-1934", index and images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/QJDP-RGNY : accessed 02 Jun 2014), John J Turner, 1892. John filed for an invalid pension from Missouri in 1892.
"United States 1890 Census of Union Veterans and Widows of the Civil War", index and images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/K8SY-TKN : accessed 02 Jun 2014), John J Turner, 1890. John is living in St. Louis, Missouri in 1890, and is listed as a veteran of the 54th Massachusetts - Company D.
"Iowa, Marriages, 1809-1992," index, FamilySearch (https://familysearch.org/pal:/MM9.1.1/XJ5X-1SW : accessed 02 Jun 2014), John J. Turner and Ella Boyed Kiney, 23 Nov 1882; citing Cedar Rapids, Linn, Iowa, reference 2:3K5NV9V; FHL microfilm 1686058. I am not certain that this is the John J. Turner who fought in the Civil War. However, the fact that he is listed as John J. Turner, born in Columbia, PA, the son of Solomon Turner, makes this record worth considering.
"United States Civil War Soldiers Index, 1861-1865," index, FamilySearch (https://familysearch.org/pal:/MM9.1.1/FS5P-159 : accessed 02 Jun 2014), John J. Turner, 1861-1865; citing military unit 54th Regiment, Massachusetts Infantry (Colored), Union Soldier, NARA microfilm publication M544, roll 41 (Washington D.C.: National Archives and Records Administration, n.d); FHL microfilm 881910.
"United States Civil War Service Records of Union Colored Troops, 1863-1865," index, FamilySearch (https://familysearch.org/pal:/MM9.1.1/JZ6F-27K : accessed 02 Jun 2014), John J Turner, 1863; citing "Compiled Military Service Records of Volunteer Union Soldiers Who Served with the United States Colored Troops: 1st through 5th United States Colored Cavalry, 5th Massachusetts Cavalry (Colored), 6th United States Colored Cavalry," Fold3.com; military unit 54th Massachusetts Infantry, Tucker-Wentworth, NARA microfilm publication M1898, roll 17.
Turner, John J. 20, sin.; laborer; Columbia, Pa. 19 Mch 63; 29 May 65 St Andrews Parish S. C; dis. $50. Wounded Jly 63. Source: Luis F. Emilio. (1894). History of the Fifty-Fourth Regiment of Massachusetts Volunteer Infantry, 1863-1865. 2nd Edition. Boston: Boston Book Company, page 358.